microg/GmsCore · error · IllegalArgumentException

transitions can't be empty.

Error message

transitions can't be empty.

What it means

The ActivityTransitionRequest(List<ActivityTransition>) constructor requires at least one transition: an empty transitions list (or one with duplicates) triggers IllegalArgumentException with this message during construction.

Solutions

1. Add at least one ActivityTransition before constructing the request
2. Skip requesting transition updates when no transitions are configured

When it happens

Trigger: Thrown at play-services-location/src/main/java/com/google/android/gms/location/ActivityTransitionRequest.java:62 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of microg/GmsCore@157c9d86ac (2026-09-06). Data as JSON: /api/errors/34cd4c01234b3ca5. Report an issue: GitHub.

Appendix: source

Thrown at play-services-location/src/main/java/com/google/android/gms/location/ActivityTransitionRequest.java:62

            if (res != 0) return res;
            res = Integer.compare(o1.getTransitionType(), o2.getTransitionType());
            return res;
        }
    };

    private ActivityTransitionRequest() {
    }

    /**
     * Creates an {@link ActivityTransitionRequest} object by specifying a list of interested activity transitions.
     *
     * @param transitions a list of interested activity transitions
     * @throws NullPointerException     if {@code transitions} is {@code null}
     * @throws IllegalArgumentException if {@code transitions} is an empty list or if there are duplicated transitions in this list
     */
    public ActivityTransitionRequest(List<ActivityTransition> transitions) {
        if (transitions == null) throw new NullPointerException("transitions can't be null");
        if (transitions.isEmpty()) throw new IllegalArgumentException("transitions can't be empty.");
        Set<ActivityTransition> set = new TreeSet<ActivityTransition>(IS_SAME_TRANSITION);
        set.addAll(transitions);
        if (transitions.size() != set.size()) throw new IllegalArgumentException("Found duplicated transition");
        this.activityTransitions = Collections.unmodifiableList(transitions);
    }

    /**
     * Serializes this request to the given intent.
     *
     * @param intent the intent to serailize this object to
     */
    public void serializeToIntentExtra(Intent intent) {
        intent.putExtra(EXTRA, SafeParcelableSerializer.serializeToBytes(this));
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;

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